Fig. 1

High-performance liquid chromatography chromatogram showing consistent retention time between a the presumed glucobrassicin (GBS) peak (9.7 min) from a cabbage sample used in this study and b the retention time of a known GBS standard (Product # 80593, PhytoLab, Vestenbergsgreuth, Bavaria, Germany) which was desulphated prior to analysis. Peaks between three and 15 min correspond to individual GSLs. This study was concerned only with GBS, and so the peak at 9.7 min was the only one that was quantified and compared to a standard